Verge tiles not sitting right

[kestrel]

Ive noticed that some of my verge tiles dont look like they sit quite right.....notice the gaps between the first few tile courses?

 

 

After having cleaned up the moss ive have a few leaks around this area and cant find any damaged or broken tiles

 

Do you think the gaps could leave the tiles prone to leaks from wind driven/heavy rain? especially with the run off from the gutter above (which has been straightened out since taking the pics)

 

Is there anything i can do to seal up these gaps to prevent the likelihood of water being blown up into the gaps?

[tonyshouse]

Undercloaks drag water into the verge, looks like a bit of wind uplift to me too 

[kestrel]

is there any way to prevent/reduce water getting in? (Ideally would like to not have to get the verge re bedded if possible)