Yours is the norm.
I’m not sure with limited info for Mrs.KZN eg do they do this every March/beginning of April, or is this a one off realignment. For you guys, just check the gross pay across this entire period is as expected.
The PAYE system always comprises 53 weeks, I assume because 52 x 7 cannot attain 365 or 366. This has no effect on calendar month paid employees.
I presume, as you kind of touched on, this happens to be PAYE year of 53 weeks for that particular employer. This has to happen occasionally...