Hi stavroscha,
we actually created a site on siteground https://wptester.info/ to test your issue.
you can check it yourself. it is a test site and in RFQ mode. we tested it in the following ways:
turned on debug:
1: RFQ checkout with both cookies and php sessions
2: Normal checkout with both cookies and php sessions
caching:
Minify CSS Files enabled
Combine CSS Files enabled
Preload Combined CSS enabled
caching Types
Dynamic Caching enabled
File-Based Caching enabled
exclusions from cache : NONE. we purposely chose not to exclude anything
we also uploaded about 30 misc plugin just to try to create a conflict.
all the requests went through. we did get a few notices that i am printing here. just because it is a testing site.
`[16-Feb-2022 21:05:08 UTC] PHP Notice: Undefined index: key in wptester.info/public_html/wp-content/plugins/woo-rfq-for-woocommerce/woo-rfq-includes/woo-rfq-functions.php on line 61
[16-Feb-2022 21:05:09 UTC] PHP Notice: Undefined index: HTTP_HOST in wptester.info/public_html/wp-content/plugins/woo-rfq-for-woocommerce/woo-rfq-includes/woo-rfq-functions.php on line 57
we have not been able to duplicate this problem on SiteGround ourselves or through other people who tested for us.
this is a screen recording to see one of our tests.
We definitely don’t want to deny your experience. we just can’t duplicate it in anyway.
We are at a loss as to what this could be.