Image sizing

We are using the summary large image card on our blog (insideintercom.io).

For some reason, our images are being constrained at 435px wide, even though the featured image we upload is much wider, 760px.

We’ve got the largest image size selected in the Twitter Cards plugin, 560x750px, but it’s not clear where the 435 constraint is coming from.

I tested several crop options, crop, smart crop and no crop. No difference, keeps on chopping off the image on the right size and artificially constraining it.

Any ideas?

https://ww.wp.xz.cn/plugins/jm-twitter-cards/