Quote:And if you don't want to do a mature answer, don't waste your time typing in my thread ok...I'm not here to start an retarded war because of this.

You're the one being immature almost demanding the devs to report to you and to fix your problems. Be happy this emulator even exists for free and stop whining. We already gave you a nice workaround and you still whine because the resolutions are not high enough for your taste.

Upscaling was never meant to be used on PS2 games, thus you get upscale bugs like the horizontal lines. It's expected behavior really and should not be considered a 'bug' since applying upscaling is NOT accurate emulation in fact. Since it works fine in native, the emulator does it's job properly.
x4 and a custom resolution are practically very close. Since the game's native resolution is 640x512 4x scaling gives you: 2560x2048. So just find a custom internal res close to this number that works without the lines...