Hello Shangelina,
Thanks you for you warm feedback, glad you like it !
Can you tell me what mobile navigator you got ? The bug appears only when scrolling if I understand well.
For the second error, it’s strange it appears all a sudden, what version of WordPress are you using ?
For your information it’s just a warning, so nothing serious, warnings can generally be turned off on the hosting side. However I’ll look forward to fix it for the next update of this theme.