u/opairesells

Hey everyone,
I’m a seller up here in Canada and I’ve been shipping to the US using FedEx labels bought through eBay. Lately, I’ve been getting hit with extra charges ($3-5) on pretty much every order after they’ve already been delivered.
I’m pretty meticulous about weighing and measuring my packages, so I’m confused about why this keeps happening. It’s definitely starting to eat into my profit margins.
Is anyone else dealing with this?
Are these just common "adjustment" fees that I can't avoid?
Is there a specific surcharge I should be looking out for?
Is it even worth trying to dispute these through eBay, or is it a waste of time?
Any advice or tips on how to stop these charges (or fight them) would be huge. Thanks!

Im from Canada and moved here 9 month ago from Pakistsn (The biggest importer of used clothing in the world) with 7 years of experience in that field. I started my store on ebay and Poshmark back in October. Since then i have listed about 1500 items as of April 30th. i have been selling roughly 10% of my listed inventory every month doing about 4 to 5k last month in net revenue after fees and everything? are these numvers on track? im targetting 10000 listings by the end of year and 30k in net revenue. am i on the right track ? is it even possible ? supply is not an issue as i have good sourcing. I used to do wholesale orders from Pakistan so i know what to sell.