I changed the brand of min+fin and getting some shed need some guidance

Hi I am 20M, using topical min 5%+ fin 0.1% and i did not get any satisfied result ( i think not even initial shed was there ( not sure )) so i thought to go for a different brand which was also cheaper in price as soon as my previous bottle ended i started using the newer one but now instantly i am feeling like i am getting some shed due to which i am surprise and want to know what could be the reason,
is it because i switched from one brand to other? which i honestly do not think so because the drug should be the same no matter what !? But then why is this shed happening ?
is it because the brand i bought is not so good ( as they were cheap and the min + fin are diluted there ?? )
or is it just a normal shed ??

i am bit confused related to this and that is why i needed some guidance from y’all as you guys must be more experienced

the brand i previously using was MorrF5 the brand i am currently using is Zeelab’s MinoxilF both were lipid based

Also sorry for my bad english its not my first language