If the tide times are a few minutes ahead or behind, that's quite normal.
The tide calculations can only calculate estimates. There are many factors that could influence the tide cycles and bring the calculations a bit out of sync. The tide predictions are quite convenient for fishing but don't rely on it, if your life depends on it.
In most cases and for most tide stations the prediction is quite correct to within 15 minutes to half an hour of the actual tide.
But some tide stations can be off a bit more. Especially harbours, river mouths or places with irregular tides.
If you have more then one tide station available at your selected location it might be worthwhile to check which one gives the best results. Once a new location is selected the available tide stations are listed just above the tide clock.
cheers and happy fishing
hope everyone is having a great holiday
a snapper a day keeps the doctor away