Why failed round tripping from XSD to XML sample to XSD sample?

I am new to XML and XSD. When I convert an XSD to XML and then convert the XML that I made to a schema, it does not have the same structure. Should it should be the same structure?

 <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
     <xs:element name="invoice">
     <xs:complexType>
     <xs:sequence>
     <xs:element maxOccurs="unbounded" minOccurs="1" name="dept" 
    type="deptType"/>
     </xs:sequence>
     </xs:complexType>
     </xs:element>
     <xs:complexType name="deptType">
     <xs:sequence>
     <xs:element name="deptnum" type="xs:string"/>
     <xs:element name="deptname" type="xs:string"/>
     <xs:element name="deptaddress" type="xs:string"/>
     <xs:element name="deptlimit" type="xs:integer"/>
     <xs:element maxOccurs="unbounded" minOccurs="1" name="deptstatement" 
    type="accountType"/>
     </xs:sequence>
     </xs:complexType>
     <xs:complexType name="accountType">
     <xs:sequence>
     <xs:element name="accountid" type="xs:integer"/>
     <xs:element name="accountdate" type="xs:date"/>
     <xs:element maxOccurs="unbounded" minOccurs="0" name="accountcharge" 
    type="chargeType"/>
     </xs:sequence>
     </xs:complexType>
     <xs:complexType name="chargeType">
     <xs:sequence>
     <xs:element name="chargeid" type="xs:string"/>
     <xs:element name="chargeamount" type="xs:decimal"/>
     <xs:element name="chargedate" type="xs:date"/>
     </xs:sequence>
     </xs:complexType>
    </xs:schema>

I converted the above XSD to the XML below

<?xml version="1.0" encoding="utf-8"?>
<invoice>
    <dept>
        <deptnum>1</deptnum>
        <deptname>ac</deptname>
        <deptaddress>hull</deptaddress>
        <deptlimit>1</deptlimit>
        <deptstatement>
            <accountid>1</accountid>
            <accountdate>2020-09-09</accountdate>
            <accountcharge>
                <chargeid>12</chargeid>
                <chargeamount>1.2</chargeamount>
                <chargedate>2020-09-09</chargedate>
            </accountcharge>
        </deptstatement>
    </dept>
</invoice>

but when I convert this XML to schema again in Visual Studio I get this:

<?xml version="1.0" encoding="utf-8"?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:element name="invoice">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="dept">
                    <xs:complexType>
                        <xs:sequence>
                            <xs:element name="deptnum" type="xs:unsignedByte" />
                            <xs:element name="deptname" type="xs:string" />
                            <xs:element name="deptaddress" type="xs:string" />
                            <xs:element name="deptlimit" type="xs:unsignedByte" />
                            <xs:element name="deptstatement">
                                <xs:complexType>
                                    <xs:sequence>
                                        <xs:element name="accountid" type="xs:unsignedByte" />
                                        <xs:element name="accountdate" type="xs:date" />
                                        <xs:element name="accountcharge">
                                            <xs:complexType>
                                                <xs:sequence>
                                                    <xs:element name="chargeid" type="xs:unsignedByte" />
                                                    <xs:element name="chargeamount" type="xs:decimal" />
                                                    <xs:element name="chargedate" type="xs:date" />
                                                </xs:sequence>
                                            </xs:complexType>
                                        </xs:element>
                                    </xs:sequence>
                                </xs:complexType>
                            </xs:element>
                        </xs:sequence>
                    </xs:complexType>
                </xs:element>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>