[Plugin: WooCommerce] "Select Options" Button Resizing on Hover

I’m using the Custom Community Theme version 1.17.3.1 with the WooCommerce plugin (free version). My website is RavenousBookTours.com. I’m having problems with the “Select Options” and “Add to Cart” buttons in the “You may also like…” portions of my products pages and in the catalogue (Shop page). When you mouse over these buttons, they flutter between the large size (normal state) and a smaller size (hover state). Is there any way to get this to stop? I’ve only done one modification to the CSS for the theme and that was to change the size of the featured products to 50% of their usual size. I took this CSS code out of the “Edit CSS” tab on the Theme settings and the buttons are still fluttering, so I’m pretty sure it’s not the CSS.

I’m using WooCommerce on my other website (https://www.ArialBurnz.com) and the buttons do not flutter over there. I’m using the Mantra Theme, though. (Annoyingly, my product images are inconsistent, going between squares and portrait-rectangular images. I would like them all portrait rectangles, but that has been another problem I haven’t been able to solve – please see my Arial Burnz site and click on “shop” to see that one).

Any suggestions about either of the above issues? I have tried to search for this problem in the forums and I didn’t see anything, so forgive me if this has already been addressed and I missed it.

Thank you!!!

Arial Burnz