Hello,
1), 2) Loop option causes the issue if you don’t have enough products in the list (only 3 for exaple) but set more products to show in options (4 for example) https://prnt.sc/wjrcjo So, disable that option if you don’t have enough products in that category.
3) Don’t see the mentioned issue https://gyazo.com/59428d92af07ed0c420106b845623cd9
4) Provide us with FTP access to your site to check the issue with the buttons translation for the Ajax tabs.
Regards