Style not updating after product quantity change

[TucoSalamanca]

Hey guys, im having the following problem which im not even sure how to explain because im a total newbie when it comes to websites but i made a video for you guys so you could understand .

So basically you can see that everything looks good on the cart summary block, sometimes after quantity change it loads back up all good (i don't really mind the style not displaying for 1 sec because of refresh but i would be nice for that not to happen as well)  but eventually it doesnt load anymore and you can see that the price in orange remains in the black font and also the delete icons are leaving the building.

I use custom leo theme and one page checkout module, maybe an easier way would be to somehow make the product summary block use the classic styling from one page checkout instead of the style from my custom theme but i have no idea how to achieve that

Another issue is (at the end of the video) the price in English language has the currency under the price not after it while in other 2 languages works as intented, would like to know how i can fix that as well.

Thanks a lot guys, waiting patiently for your help because im lost

Edited October 5 by TucoSalamanca (see edit history)