Cannot recover rescue mission targets

[Auriga_Nexus]

I was playing a contract where I had to pick up 3 NPC Kerbals from a crash site on Kerbin and take them to a KerbinSide base.

It took me about 20 minutes to fly a supersonic jet to the other continent. I landed ok, but when it came time to find the Kerbals a strange bug kept happening. The Kerbals would appear as target signatures, but once I got within 250 m of them they would fall "through" the ground for about 300 m before stopping accompanied by a "splashdown" sound effect. Tried going to tracking station then back to my jet, doing so would reset the ones that had fallen through but they would do it again the moment I got close to them, either taxiing or on EVA.

These are my installed mods:

KSP: 1.0.4 (Win32) - Unity: 4.6.4f1 - OS: Windows 7 Service Pack 1 (6.1.7601) 64bit

Better Science Labs Continued - 0.1.2

ChuteSafetyIndicator - 1.0.1

Community Resource Pack - 0.4.4

Contract Configurator - 1.6.3

Contract Pack: Anomaly Surveyor - 1.3

Contract Pack: Base Construction - 0.2.1

CC-CP-SCANSat - 0.5.2.1

Contract Pack: Field Research - 1.0.6

Contract Pack: Initial Contracts - 1.0.4

Contract Pack: Kerbal Space Station - 2.1.2

Contract Pack: RemoteTech - 2.0

Contract Pack: Grand Tours - 0.1.7

Contract Pack: Unmanned Contracts - 0.3.10

Contract Pack: Tourism Plus - 1.1.8

Docking Sounds - 1.2

DSD Mobile Labs - 1.0

Editor Extensions - 2.12

AGroupOnStage - 2.0.11

RasterPropMonitor - 0.21.2

Kerbal Attachment System - 0.5.4

Kerbal Engineer Redux - 1.0.18

Kerbal Joint Reinforcement - 3.1.4

KerboKatzUtilities - 1.2.9

CraftHistory - 1.4.3

KerbalScienceExchange - 1.1.1

Kerbal Inventory System - 1.2.1

KSP-AVC Plugin - 1.1.5

LaunchCountDown - 1.7.5.86

Kerbal Konstructs - 0.9.1

ModularFlightIntegrator - 1.1.1

Docking Port Alignment Indicator - 6.2

EVAHandrailsPackContinued - 0.2

Final Frontier - 0.8.6.1370

PartCommander - 1.0.2.4

Pilot Assistant - 1.11.6

RemoteTech - 1.6.7

SCANsat - 1.1.4.1

SpaceTux: Shared Assets - 0.3.6

Kerbal Alarm Clock - 3.4

Alternate Resource Panel - 2.7.2

TweakScale - 2.2.1

Waypoint Manager - 2.4.2

I'm going to hazard a guess that part of this comes from the fact I have the 64-bit version (I think) but otherwise don't know what's wrong.

[Auriga_Nexus]

Still does this even with 32-bit. I've stopped playing Career mode for now but I really would like to figure out what's wrong here.