Filament prints poorly?

Hi, I've had a 3D printer (BambuLabs A1 Mini) for a few months now and am currently experimenting with a few filaments. So far, everything's been fine, but for some reason, I'm having major problems with the Amazon Basics PLA… the first layer doesn't adhere well, the ends are bulging, it feels like too little filament is coming out of the nozzle in some places, and most importantly, small clumps are forming on the heated bed (see photo). I've never had these problems with any other PLA. Cleaning the print bed, recalibrating, and minor temperature adjustments haven't helped so far. Any ideas?

Thank you and best regards