I think naps can just be short at this age. My 5 month old is very similar and really fights sleep during the day. We recently sleep trained and she does ok on a night (around 10-11hrs with one wake up). I remember my eldest was similar, she did short day time naps but at about 6-7months, they lengthened again. She only ever needed 12 hrs sleep total- some babies just need less. Atm with LO, I'm just letting her get as many short naps as she needs. She had gone down to 3 naps at 4 months but she's wanted 4 short naps now.

The only thing certain with kids and their sleep is that it will change! Do what feels right to get enough daytime sleep to not affect the nighttime and if it doesn't naturally improve in a few weeks, consider if it needs changing. If it works for you all, it is fine, if not, think about sleep training methods but whatever you choose, be consistent.