Hello Artem,

1. Glad to hear, that you will fix this.
However, before receiving your response I found that, Buy Now button suddenly shows ALIGNED with Add to Cart even when the Smart coupons plugin is Activated and text enabled on product page too, as can be seen here.
https://i2.paste.pics/H7A9M.png
Video – https://watch.screencastify.com/v/492dUXgjE4QNr8LNrrFH

Have you actually fixed it on our staging site or it automatically got fixed (as I actually deactivated this plugin and re-activated back, and it worked) Not sure, how.
PS: Not using any cache plugin on staging site. Nor cleared browser cache.

4. Which one you answered this for –

4. It seems to be affected by some modifications made in the child theme.

Is it for point 4) or 4.b) as shown below-
https://i2.paste.pics/H7IFB.png
Can you please suggest on point 4.
For 4.b) And can that be checked using Admin details of staging site, that we shared earlier.

Regards