Web Element changes during set text

I have a test that is filling out a sign up form and it randomly decides to change fields durning the set text commad. I ignore the first name field and set the last name field it will enter 1-3 of the letters in the last name field then change to the first name field and enter the rest of the text.
WebUI.setText(findTestObject(‘Page_Sign Up/input_lName’), lastname)
It has done it in chorme, edge and firefox. I have tried using just a string and a variable for the input. I am using the windows 64bit version of Katalon with fully updated browsers and followed the config directions for the browsers. How do I prevent it from changing fields during the set text command?