I have such a problem with woocommerce plugin. Since last upgrade of woocommerce to last version I can see "×" instad "x" in dimension section in variant product. So I can see for ex. "&15times;15×15cm" instead "15 x 15 x 15cm".
Official support recommends me to disable every plugin (try to plugin conflict) and activate storefront theme. I trie both of theese solvings and still no success (this means that problem could be in original woocommerce plugin). You can watch screenshot of this issue here:

Thanks for help