weird border between sections, on top of footer

I have a custom footer on this site, the top of which is a gray section that says “Sign up for our email newsletter”. There are no borders set on that section, nor on the section above it. On the Home Page, there was all of a sudden a black border on top of that section and, after checking everywhere couldn’t figure out where it was coming from… it wasn’t on any other pages. I tried the section above it – it had no bottom border, and the border only showed up on the home page, not any other pages. So I changed the section above it from a grid row to a color seciton, and it went away. Screenshot here: https://36871d0adc.nxcli.net/wp-content/uploads/2021/04/screenshot-36871d0adc.nxcli_.net-2021.04.13-15_48_14-scaled.jpg

Again, I removed it by changing the type of seciton above it, but now I’m working on another page – Member Benefits – and the line appears again, see this page here: https://36871d0adc.nxcli.net/members/member-benefits/

I just can’t figure out why this black line keeps appearing right above that section, or for what reason. I also tried removing all of my custom css, and when I did, that didn’t help either.

Any ideas? It’s driving me crazy!