@jpaskaruk Both are high suspects, but without retraction most filaments will look something like that. The type of plastic also matters as some just ooooooze and ooze.
These days there are lots of people who claim that you shouldn't even print from a fresh bag. Put it straight into a dryer and go from there there. A ziplock is not airtight, so, that's an easy upgrade.
I live in an extremely dry climate, so it doesn't tend to affect me much.
The other option is to use those uprights as a slow test print (in your slicer, move the rest of the model below the plate so it only prints the uprights) and slow all the movements down to ridiculously slow levels, then watch the nozzle. Is it oozing? Is it popping (this is water getting converted to steam), etc.