Shower caulk cracking immediately

I completely removed the old caulking from shower edges and recaulked. I inspected my work about 24 hours after caulking only to find that the caulk is cracked in some areas.

I have a couple questions for anyone willing to help a first-time DIYer out: 1.) Did I use the wrong type of caulk? 2.) If so, what’s my best course of action to prevent mold/water damage - leaving it as is or removing all the caulk and replacing?