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Yeah I tend to use a wand. Being a stout in dark bottles some of these were slightly fuller than usual but most have about 2-3cm headspace.
The only thing I can think of was that it was higher (1018 as opposed sto about 1014) than I usually bottle, although it had had over 2 weeks in the primary, first week around 20c. I'm wondering if I didn't add enough extra yeast to counteract the extra sugar although if have thought that would lead to extra fizz in the bottle.
Maybe you needed to leave more headroom in the bottles. Did you use a bottling wand ? I usually use a wand ,fill to the rim and when you remove the bottle there is room at the top.