You may not have entered the MAC address correctly. You can use the example in step 6 of the tutorial below for what the MAC address looks like in the command prompt and how to enter it for a router's MAC filtering.
As suggested Brink, you might have entered the IPv6 adress instead of the mac adress...check again whenever "left click" on your mouse the icon on the taskbar to see your network icon then "right click" to see your mac adress.
Computer type PC/Desktop System Manufacturer/Model Number [June 2013] - Swapped to full tower OS Windows 7 Professional SP1 - x64 CPU Ivy Bridge Core i5 3570k Motherboard Asus P8Z77-V LE PLUS (Full ATX) Memory G.Skill DDR3 PC3-12800 (16Gb) Graphics Card Sapphire HD 7770 Vapor-X Oc Sound Card Creative Sound Blaster Z (Red Leds) w/5.1 sound system Monitor(s) Displays Asus Led 21,5" Screen Resolution 16/9
Keyboard Razer + Razer TE gamepad Mouse Razer Imperator 2012 (4G) PSU 700w 80+ Gold (ErP Lot6 ready) Case Thermaltake Chaser A71 Cooling Gelid Solutions (PWM Push/pull Fans) Hard Drives Internal:
500Go Sata 6Gb/s (x2)
500Go Sata 3Gb/s (x2)
SSD 60Go Sata 6Gb/s Antivirus MSE 4.4 Browser IE11 Rtm Other Info GPU Virtualization (iGpu + dGPU)
You can also double check your router's log files for a MAC address of a computer that had a failed attempt to connect with the same time that you tried to see if it matches any of the MAC addresses of your computer from below.
How did you enter the MAC address, and did you have any other MAC (Physical) address listed in the "IPconfig /all" report? You will have more than one if you have more than one network adapter.
Computer type PC/Desktop System Manufacturer/Model Number Home built OS Windows 7 Ult, Windows 8.1 Pro, CPU Q9650-4.275GHz, E8600 4.5GHz, E6750-3.8GHz Motherboard Evga 780i FTW Memory G.Skill PC2 9600 1200Mhz 5 5 5 15 2T Graphics Card GTX480 Sound Card Asus Xonar D2 Monitor(s) Displays HannsG Screen Resolution 1680X1050
Keyboard Logitech G15 Mouse Logitech G9 PSU ThermalTake Toughpower 1000Watt modular Case ThermalTake XaserV Cooling Xigmatek S1283 Hard Drives GSkill Phoenix Pro 120GB SSD Internet Speed T1