Before I ask my question I should point out that spelling is not my strong point, so please don't turn this thread into a spelling rant - especially against me. 
I'm honestly curious about the latest 'trend' I've noticed of confusing the word brought, with bought.
An example would be (totally made up, not taken from anything I've read); "I once brought a tv in Curry's, it cost me £600..."
Is this a spell checker issue, or are people genuinely confusing the two words?
I'm just about getting my head around the use of 'of' instead of 'have'; another example (for those that don't know what I'm talking about) would be: " I should of bought the £600 tv at Currys."
In a way this makes sense because have, or 've, is often pronounced as 'of'. Or so it seems from watching the soaps.
But I can't get my head around bought becoming brought.
Can someone please enlighten me? 
Ohh, before anyone wonders, I've not actually noticed it on this forum, just thought I'd ask on here though as it's friendlier.
I'm honestly curious about the latest 'trend' I've noticed of confusing the word brought, with bought.
An example would be (totally made up, not taken from anything I've read); "I once brought a tv in Curry's, it cost me £600..."
Is this a spell checker issue, or are people genuinely confusing the two words?
I'm just about getting my head around the use of 'of' instead of 'have'; another example (for those that don't know what I'm talking about) would be: " I should of bought the £600 tv at Currys."
In a way this makes sense because have, or 've, is often pronounced as 'of'. Or so it seems from watching the soaps.
But I can't get my head around bought becoming brought.
Ohh, before anyone wonders, I've not actually noticed it on this forum, just thought I'd ask on here though as it's friendlier.