http2 enabled but still use http1.1

hello , i contact to my server to enable http2 , they done it and when i check my site in tools.keycdn the http2 is show : HTTP/2 protocol is supported.

but when i use inspect > network or gtmertix all my web site file are load from http1.1 protocol

i use wp-rocket for speedup plugin and wordpress 5.7

whats the problem ? why my site still use http1.1 ??

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