Guest mode not working well on mobile

#1
Hello, I am trying to optimize the website speed for mobile and I tried with Guest Mode, Guest Optimisation and Cache mobile. The speed score increased, but the user experience is being affected as there is a blank page with some letters and weird format loading, and it requires reloading the page for accessing to the normal page.
Could you please help me to fix this?

Thank you,
Raquel.
 
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