Trying to apply for non-b from UK and when i clicked submit the form and choose submit by post.. this page pop up and the text box wont work. idk what to do. Need some suggestion?

Dear TVA fam. My tr visa expires on November 2. I will be doing a non b in Vientiane next week. If my tr visa expires on Nov 2 does that mean. I have to exist Thailand on any day before Nov 2 including Nov 2?I pose this question because I will be going from Chiang Mai to Bkk Don muang and then from Bkk to udon thank on November 2 via air Asia. Will arrive at the border around 2 p.m and I'll stamp out on November 2nd. I'm just scared immigration Don muang say something since my visa expires on Nov 2 and I'm traveling from Don muang to udon thani on November 2 to cross the land border in nong khai.