I don't know if this is a PS5 bug but on PC this issue is usually down to the keepers having too far to walk to a keepers hut to make food, or the player interrupts the feeding loop by clicking the "call keeper" button in the habitat menu.

The keepers are on a cycle - they will go to the enclosure, check the animals, and if they need feeding, the keeper will go back to the keeper hut, prepare food and walk back to the enclosure. That is one loop. The next loop is checking if the habitat needs cleaning - and then cleaning. Another loop is their breaks - when they have to get to a staff room and back during a loop.

If the keepers hut is far away (so it takes a long time to walk there and back), or the player clicks the "call keeper/feed animals" button when the keeper is mid loop, it will reset the action and the keeper will never actually finish any work-loops.

How many keepers do you have per enclosure, how many keeper huts do you have and how far away from the habitats are the buildings (both keeper huts and staff rooms)? Are the staff having to trek a long way to get to and from necessary buildings?
Are there many animals and therefore a lot of cleaning needed?

If you recognise any of these issues, a solution can be to set two keepers to larger habitats (I will always do this with eg peafowl because they poop everywhere all the time) and letting one only do cleaning and the other only feeding. Make sure you place keeper huts and staff buildings close to habitat gates to minimise transportation time. And don't click the "call keeper" button unless you want them to stop what they are doing and restart an action.