crwdns2933897:0crwdne2933897:0

In the navigation bar, there is lines, is it display problem or other?

i have been using this tab almost one year, but the lines are showing, black and white in the navigation bar, tell me how to resolve this, give the solution

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2853045:0crwdne2853045:0 crwdns2853046:0crwdne2853046:0
crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0