(edited by Konner.7281)
Strange "Grid" graphics glitch
You will find others with 1070 issues here: https://forum-en.gw2archive.eu/forum/support/bugs/Lighting-Issues-Game-Update-4-18/first#post6558704
Good luck.
Hm i thought it was fixed when light blinking bug apper…seems not everywere. Set your shadow setting to low and restart client it must fix grid. GW 2 dont like 10xx cards dont know why.
To be honest squares and grind its 10xx ilness. For nearly year of using GTX 1080 i found similar things in some games. Some fixed it asap like warframe, some too minor like in Planetside 2 fog night fight, i noticed it 1 time after 2 week of playing. But GW 2 had huge inpact from this. But its nvidia fail too and they dont care about it. As for me i will look at amd card when i will upgrade my pc next time after 10 years of nvidia use, i think its time to punish they with our $.