TreeGrid - inacurate touch for expand/collapse nodes on IPad

Using version 10.0d to expand/collapse a node on ipad2 Safari i have to tap right under the +/- icon, on ipad Chrome I can tap on the icon as expeced, as on any browser on PC or Android

IPad2 ios version 7.1.1 (11D201)

UserAgent: Mozilla/5.0 (iPad; CPU 7_1_1 like Mac OS X) AppleWebKit/537.51.2 (KHTML, like Gecko) Version/7.0 Mobile/11D201 Safari/9537.53