Why is scroller setting a fixed width on my table?

ikickbutt

Why is scroller setting a fixed width on my table? I could not figure this out for the life of me. I ended up add a css override to fix it but I'd love to avoid doing that.

See screenshot A (browser and call): https://www.evernote.com/shard/s313/sh/00f67270-f92b-4695-901c-0c9b0153b97a/9b4e61fe5751b2d23fafe71d843d5575/deep/0/Screenshot-3-18-15,-3-27-PM.png

See screenshot B (table html): https://www.evernote.com/shard/s313/sh/c7891fc8-489e-4d4e-9478-65ed9443ecd2/71da2c15a1719c801942b0743eac4f6f/deep/0/inc-modal-add-team-member.html---envision-ux-v02-and-WebIZ-Prototype---Off-Canvas.png

See screenshot C (scripts):
https://www.evernote.com/shard/s313/sh/dac8820d-dc37-4d94-ba8c-cc78a8d1fb94/cec502332fc75117b5c06d603be1c4c6/deep/0/inc-proto-head.html---envision-ux-v02-and-WebIZ-Prototype---Off-Canvas-and-envision-ux-v02---ruby---80-24.png