[mpv1961]

After having my girls for over a year and all being regular layers one of my girls has decided to lay a very strange egg shells it sort of ribbed/crinkley looks like melted and reset wax has been down it. Has anyone got any ideas as to what may have or is causing it.   

[LittleRedHen]

I think those are called lashers.  My hens occasionally lay those too.  I'm sure someone will come along with much better advise for you.  I don't believe a one off is anything to be concerned with.