Appending MR etc seems to be a trend (ie becoming more commonplace) for air tickets/boarding passes and, particularly when names are relatively long, this might be without a space. Examples:
Since very likely Aegean's custom, their staff should cope with interpreting this. The key point may be that the website you refer to does indeed recognise you correctly. Without a space it seems understandable that your forename is being interpreted as everything before the virgula suspensiva.
Attribution for the images above (in order):
http://www.a2zlifestyle.com/travel/the-best-day-to-book-airline-tickets/
http://www.india-forums.com/forum_posts.asp?TID=1204921&TPN=50
http://www.flickriver.com/photos/retokurmann/4124561291/
and for the one below that shows the use of MR long before 2001:
http://hostagencyreviews.com/airline-fare-types/
KLM mentions "No need to correct your name: ... If your ticket shows your names in a different order, without spaces and/or with ‘MR’, ‘MRS’ or ‘MS’ between your names – this is how names are shown in our systems...."
"No need to correct your name: ... If your ticket shows your names in a different order, without spaces and/or with ‘MR’, ‘MRS’ or ‘MS’ between your names – this is how names are shown in our systems...."