so Audrius Ramanauskas, founder of Mistertango is the owner of this exchange?

About the physical address of your exchange, I found this:

Quote from: https://www.btc-exchange.com/about-us

Address: Perkūnkiemio 2, Vilnius, Lietuva

Source:https://www.google.com/maps/place/Perk%C5%ABnkiemio+g.+2,+Vilnius+12128,+Litu%C3%A2nia/@54.7418732,25.2225843,3a,75y,156.26h,90t/data=!3m7!1e1!3m5!1shC4B3pCqJP0P67qowTYpng!2e0!6s%2F%2Fgeo2.ggpht.com%2Fcbk%3Fpanoid%3DhC4B3pCqJP0P67qowTYpng%26output%3Dthumbnail%26cb_client%3Dsearch.TACTILE.gps%26thumb%3D2%26w%3D86%26h%3D86%26yaw%3D156.2584%26pitch%3D0%26thumbfov%3D100!7i13312!8i6656!4m5!3m4!1s0x46dd91a15d686957:0x3a5841a9c9a951f0!8m2!3d54.7416125!4d25.2227701

how do you explain?

your exchange is very strange, it has an ugly design. I think you need to work on designer of your exchange