It's baby talk. Precious when you're younger than 3, but becomes a habit because the speaker has not been corrected, does not care or is lazy.
Editors, advisors or producers fail to handle it by correcting on-screen personalities, many of whom are at a far higher pay level or are celebrities.
Respected English speakers are no longer in positions of authority in broadcast media or have abandoned the practice of expecting proper pronunciation in a cult of personality and tight suits. I'm 75 and began noticing it at least 20 years ago in movies or episodic TV where young women, to make an exotic dancing job seem innocent, lowered their eyes, smiled sweetly and preciously pronounced it 'shtripper' - like baby talk.