LHP

Why would HAL replace a Lefty starter in trouble with a lefty relievers??????
doesn't make a ton of sense to me...

For some reason, HAL always puts in a lefty reliever after a lefty starter unless you set up your pitching preferences to prevent it.

Hmmm, ok…and do you set your preferences to do that?

The Middle/Setup/Closer settings don't rely on LH/RH starters to make any decisions.
If you have 2 RH guys set as Setup, and both are rested, one of them is coming in the game, maybe, if HAL feels like it.
As much as the BP settings have been screwed up, this isn't something we can pin on HAL.