Do some more troubleshooting it seems to occur when more than one game from a system (not including homebrew games) is added as a favorite. I can add any number of homebrew games without issue.

I am running Recalbox 6.1 on a raspberry pi 3 b+, and I have my ROMs on a USB drive. Recently, when clicking on favorites it seems to exit emulationstation, and take me to the recalbox splash screen (the same one that shows when loading a game). It stays there and does nothing. I had around 70 games from various systems favorited. I tried removing them all and re-adding them. When I do that it works for the first one or two favorited games. Once I get to about three it goes back to crashing. Has anyone experienced this, or know why it is happening?

I am using Recalbox 6.1, and I have a Raspberry Pi 3 B+ in a Megapi case, four official Sega USB controllers, and a 3 amp power supply. I use splitters from Amazon to connect all four controllers into the two front USB ports.
https://www.amazon.com/gp/product/B07MHYVVZ8/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
When I install Retropie on an SD card and boot it up I can configure all four, and all four work. But when I use Recalbox I only need to configure one of them, and the others work. But if I plug all four into the splitters I only get two (one from each) working. I did a jstest and it only shows one controller connected to the splitter. Is there any way to make all four visible when using the splitters, as Retropie does?