Text Search to highlight cells using Conditional formatting working randomly

[mikiel111]

It`s not the first time I get issues with conditional formatting and I need to recreate the rule each time, I am getting fed up of dealing with it.
Basically I type whatever in cell B1 (top left) and any row with the word in one of the cells is highlighted.

My formatting rule type is 'Use a formula to determine which cells to format',
the rule applies to all my data plus some extra empty rows

=$A$3:$BB$529

and I`m formating values where this formula is true

=IF(ISBLANK($B$1),0, SEARCH($B$1,$A3&$B3&$C3&$D3&$E3&$F3&$G3&$H3&$I3&$J3&$K3&$L3&$M3&$N3&$O3&$P3&$Q3&$R3&$S3&$T3&$U3&$AQ3&$AR3&$AS3&$AT3&$AV3&$V3&$X3))

This sheet is full of issues like this. Why arent all my cells highlighting? They should ALL be highlighting. Not just some randomly. This is so frustrating as this particular functionality breaks so often.
Interesting to note I have a back up excel file from where I am literally copy-pasting the formulas which are working flawlessly in the backup file. Ever since i recorded a couple of macros and assigned them to icons on this sheet I got these weird issues, coincidence? I have already noted this before that ever since the addition of macros i`ve been getting harder to solve problems. The other working excel file has zero macros (though it`s .xlsm) please note.

 

[mikiel111]

Fixed.
It was not highlighting cells with #DIV/0! error

Handled with IFERROR([formula i used], "[word i used to replace #div/0!]"). It was then able to highlight the replacement word.