Which sgminer you're using? Does it support Xevan algorithm?
I use sgminer-xevan-5.5.0-nicehash-1-windows-amd64 and also had a problem, now I solved it by playing with intensity, just for ex. -I16 . I can't tell you more 'coz I mine on another pool. Hope it will help.
Also note for example for my HD7850 'xevan-mod' kernel doesn't work. I use 'xevan' instead
I tried to run sgminer-xevan-5.5.0-nicehash-1-windows-amd64 but i doest work. It gives ERR all the GPUs.
And i tried GatelessGate ang it worked but this time it always gives Invalid Shares.
What is wrong with this miner?
My .bat file is
gatelessgate.exe -k xevan --gpu-platform 1 -o stratum+tcp://pool.bsod.pw:3739 -u Sk1DHYs3ucC7potBLhc3dfxBZyGeuPYPjr -p c=XLR_XEVAN -I 16 -w 256 -g 1
And tis is the error

I tried 3 diffirent pools and the result is the same..
Then create a .bat file for SGMINER and put this in it "sgminer -o stratum+tcp://cryptohub.online:3062 --algorithm xevan-mod -u
-p x -I 20" using the email that you registered on cryptohub. If -I 20 is not stable lower it to 16 and test there.