My laptop doesnt allow me to type one letter 2 times after eachother

Ruan_2

Commendable
May 25, 2016
3
0
1,510
Eg.if i type the word LETTER my laptop only alow me to type the first T and then when i press T again it wont function pls help
 

Ruan_2

Commendable
May 25, 2016
3
0
1,510