Higee cells

[MT off grid]

I have a DIY battery kit that came with higee cells, I noticed that 8 of the cells have a white frost type residue on the under side of the vent cover, all of the cells have minor swelling around the anode and cathode, my main concern is the white frost substance, I have contacted the battery seller and told nothing to worry about and higee has not reapond to multiple emails. I can't find anything online about what it could be so any input would be great