Insight - Logs: several columns ordering is not right

Ordering of some columns behave strange. I would expect alphabetical or numeric, ascending or descending order but it seems that the ordering is somewhat random sometimes...

^ == up arrow in header of a column (ordering direction)
v == down arrow (Not used in further description. It's here just to be complete.)

Logs page: (bold cases don't work right)

• @timestamp - ^ older > newer
• _id - absolutely random
• _index - (I had only one index - nothing to order)
• _type - (I had only one host - nothing to order)
• exception - if there are logs without exception they don't show after the exception column ordered logsException.webm
• level - ^ A > Z
• host - (I had only one host - nothing to order)
• logger - ^ sometimes A > Z, sometimes random (A > Z > A > Z) logsLogger.webm
• message - absolutely random logsMessage.webm
• properties.bundle.id - column is ordered lexicographically, not by numeric value logsProperties.bundle.id.webm
• properties.bundle.name - random?? logsProperties.bundle.name.webm
• properties.bundle.version - ^ A > Z
• properties.maven.coordinates - ^ sometimes changes direction (A > Z > A) logsProperties.maven.coordinates.webm
• thread - random logsThread.webm