Image colours altered when uploaded – any ideas to resolve?

Site URL: https://www.birminghamearlyyearsnetworks.org/

Hey all,

I'm having an incredibly bizarre issue with uploading some infographics to our site, and it's even happening as I go to upload the image and screenshot to this question to illustrate my point... The colours are getting desaturated somehow? Especially obvious in a bright orange that looks greyer and darker when I upload it to the site (you might be able to see some difference between the two attachments). Anyone else seen this before?

Hi. Have you solved this yet?

Not yet, I can see the difference still (unfortunately uploading the pics here has done the same thing, so they look dimmer on these pictures than they do on the site itself)... not sure it's fixable 😂