The flags on your patio are not butt jointed, you can clearly see gaps,was this done to help drainage? they will move/slide, but if flags are pushing up the problem will be the sub base too.
The flags were butt jointed until they all started moving. I cant understand it being the sub base when where 3 flags were relaid that are part of the original path at the same time as the new patio, these 3 flags have lifted too but the original path is fine/same sub base, its like base has swelled. On the new patio where the hot tub was, this is now down and the base under it is completely flat too.
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