Hello,
Thanks for your reply. It looks like the brand is Delta on the hot/cold single knob and can't locate the model #. I just recently had the kitchen sink snaked and was wondering if this would affect the water temp. I'm no plumber as you can tell.
The kitchen sink drain has nothing to do with it, you may have debris inside the faucet in hot port what you need to do shut off the water to the shower/tub remove the handle and the cartridge, turn on the water for a few seconds, assemble the faucet and see if your problem is fixed, see the attachment and tell me if your faucet looks like this, Thanks.