Well fairies, I’ve been missing a big glitch on product pages!

Well! I didn't realize for a while that the Add to Cart button was glitching out in my Shopify store! I noticed this week that it disappeared whenever you go to a product page & wouldn't pop back up again until 6 or 7 full seconds, which may have led people to assume they were sold if they scrolled all the way down the description to see if maybe it was at the bottom and probably leaving the page after. *forehead slap*
I'd contacted customer support and was told that my site theme was too old & needed to be replaced with a newer one for the button to work as it should, and, for the payment installments notice to also be visible.
Here I was, all this time thinking that was being made available to everyone since I did activate installment payments roughly a year ago - but when I noticed the cart button issue I noticed the installments banners & notices were also not there.
Fairies, it has now been fixed. Please, if you notice any weird bugs in the future I'd love to be informed so I can address it faster.
I would like to clean the home page up further, and I will, but for now at least things are working as they should.

There are still 2 made-to-order wings left, the Cosettes - like the ones in the photo above - and the extra large Ellette wings which have been heavily discounted from the previous price of $675 down to $600.
The ready-to-ship Cosette wings have also been discounted from $595 to $559 to make up for the glitchiness.
You can browse and purchase them here: https://fancy-fairy-wings-things.myshopify.com/collections/flash-sales

I will have another set of gold veined Cosette wings in my next ready-to-ship sale if the ones currently listed don't sell in the next couple days & I pull the listing. I already have the vinyl vein layer cut & weeded so they need to be made.
I'm thinking I might go with a warm color this time as we head into fall weather, like either the Blush, Poison Apple, or Rose Gold. The Poison Apple would give a nice contrast to the gold veining.
Or should I go for something like Dark Crystal film? What do you think?