Manfrotto shoulder bag squeaking?

I honestly just couldn’t find anything about this issue on youtube or any other platform so i reckoned i’d ask here. I recently bought a manfrotto shoulder bag (messenger bag M, the cheaper one.) and it’s been squeaking from the strap. I don’t know whether this is the synthetic materials of the bag rubbing together or something else entirely. So far it’s been squeaky on every material and surface i’ve tried it on. Cotton, polyester etc. Anyone else have this issue and or solution?