Thanks for your report, that's not a bug. Free trial is given only ONCE per user per month. So if trial was removed, it means you or someone else used it from that IP.
As for FREE ones - they are free for life time without any payment. Could you please make sure that you are selecting the ones which label FREE? You can also send us email or open ticket, so we can better assist you. It looks like a bug in browser or the way you use tool... however, we will do our best to fix it in no time.
Gracias por su informe. Por favor, utilice las puertas de enlace gratuitas de por vida. Están en la parte superior de la lista marcada con la palabra clave FREE =) La versión de prueba premium se proporciona solo UNA VEZ por usuario.
Thanks for your report. Please use free for life time gateways. They are at the top of the list marked with FREE keyword =) The trial to premium is provided only ONCE per user.