Is there also a multiverse for the Incredible Hulk?
Hence why in the 2008 movie, Bruce Banner is Edward Norton while in the MCU going forward, he's Mark Ruffalo. Basically, the Banner and Hulk that we saw in the 2008 movie was a Hulk that was someone just outside of the "main" MCU continuity. Of course, that doesn't explain how we still see Robert Downey Jr.'s Tony Stark talking to Thunderbolt Ross at the end of the 2008 Hulk movie.
https://www.comingsoon.net/movies/features/1137864-cs-soapbox-the-incredible-hulk-multiverse-movie
https://www.express.co.uk/entertainment/films/1394598/Doctor-Strange-2-theory-Edward-Norton-The-Incredible-Hulk-movie-multiverse-of-madness
https://gamerant.com/incredible-hulk-fan-theory-movie-mcu/
https://thedirect.com/article/mcu-multiverse-hulk-eric-bana