Fork leaking even when new oil seals KTM 390 ADV

Hello I need some advice on to why one of my forks keeps leaking even though I bought seals twice now. FYI I haven’t done the work myself because I don’t have the proper tools . I have done the job twice in different mechanics. The first time both forks were leaking and I bought the cheapest seals available. After that one of the forks start leaking and I bought a SNK seal (I have read good things about the brand). I let other mechanic do the job and the fork started leaking a couple of days after. What could be causing it? I don’t want to expend anymore money on that tbh.