Bauble collection bug
You’re capped at 250 initially, there are two upgrades you can buy (a purse and a tote bag) that will increase the cap to 500 and 750 respectively.
What Stitch said. You could also drop your stacks in the bank before heading into the SAB zones.
You could also, to avoid the bauble cap, store your baubles in your bank when the bag runs full. When you need to buy an upgrade you could simply get them from your bank and go to the shop. This way you can have more baubles with you than the pickup limit