Some product variables not being generated?

We are using woocommerce and when creating a variable product that has more than 50 total variations, some end up missing. For example: when adding a hat to our store that has 9 available sizes and 9 available colors….I hit the “create variations from all attributes” and it comes back and says “created 50 variations”. Since it only creates 50 at a time, I hit the button again to create the remaining 31 variations (since 9 colors x 9 sizes should create a total of 81 variations). It comes back and says “created 30 variations” (instead of the 31 that were remaining). At that point I have to go through all of them to see which one it missed. This seems to only happen when the product has more than 50 total variations , but not every time, as we have some that have 10 colors and 6 sizes and they end up with the proper 60 total variations. Any ideas?? Thanks.