Shifter Lines 107: Shifty Little Arrows: Help Sleuth Find Out Why these Arrows are Shifty

Today's Puzzle:

It seems like our detective work isn't done yet with an investigation of shifty arrows. Amongst the more approachable 2* rated shifter lines.

Link to Play:

Shifter Lines 107: Shifty Little Arrows by gUBBLOR https://tinyurl.com/SudokuSleuthShifterLines107

Rules:

Normal Sudoku rules apply. Place the digits 1 through 9 in each empty cell. Digits must not repeat within the same row, column, or box.

Shifter lines: Adjacent digits within the same box on a shifter line share both parity (even/odd) AND polarity (low/high). Whenever the line enters a new box either the parity OR the polarity shifts, never both. Shifter lines can never have 5 on it. Digits may repeat on lines.

Kropki dots: A black dot between cells indicates cell values with a 2:1 ratio. Not all dots are shown.

Arrows: The digits along each arrow must sum to the digit in the circled cell. Digits may repeat on arrows.

There is a setting (under Visual) called 'Draw Arrows Above Lines', and I'd recommend you set that to 'On'.