Miss Swimsuit UK has reportedly been stripped of her title after posting a rant about the Black Lives Matter protests on Facebook.
Ms Archer-Jones, 23, made a post last month about the wave of protests prompted by the death of George Floyd in Minneapolis, US.
She questioned if Mr Floyd was innocent and said "all lives matter".
All trace of Ms Archer-Jones winning the title last year has been removed from the pageant's website, the Sun reports.
A source told the newspaper said: "Jasmine has tried to sweep it under the carpet and continue on as if nothing has happened but organisers acted quickly to airbrush her from their history.
"They have posted in support of the Black Lives Matter protest and could not afford to be associated with her."
She has also deleted the post about the Black Lives Matter protesters, which said demonstrators had used Mr Floyd's death as an "excuse to let loose" after lockdown.
Ms Archer-Jones said she was yet to see "hard evidence" that Mr Floyd was innocent when he died.
Screenshots of the post said: "If you look deeply into statistics, more UNARMED WHITE people DIED than BLACK last year."
She added: "There is video footage of him refusing to get out of his car, which warrants for the police officers to use whatever means necessary to restrain the person.
"He also SUPPOSEDLY had drugs in his system, but I doubt they will release the autopsy now... Oh and let’s not forget that George Floyd also has a criminal record dating back to the 90s."
She finished the post by saying: "I DO NOT discriminate against any person. But THIS IS NOT OK."
After Ms Archer-Jones was crowned champion of last year's Miss Swimsuit UK competition, she went on to finish 13th in the world at the Miss Swimsuit USA final.
Despite Ms Archer-Jones' Instagram still saying "UK SWIMSUIT WINNER 2019/20", Miss Swimsuit UK now lists 2018 winner Kianna Louise as the queen.
However, neither of the women are listed as "previous winners" on the Miss Swimsuit UK website.
The organisation posted in support of the Black Lives Matter movement last month.
It said on Instagram: "When is the human race going to figure out once and for all that we are all the same. Love one another."
The Standard has approached Miss Swimsuit UK and Ms Archer-Jones for comment.