Check to see that the buffer level in the upper chamber has not evaporated, or leaked, to the point that the buffer is no longer in contact with the electrode.

Your standard proteins are separated. The dye front is moving, but is diffuse and not properly stacked. Some material seems to be left behind, because of the poor contrast I can't tell whether at the top of the stacking gel or at the interface between stacking and separating gel.

• The lack of stacking points to a problem with the buffers, these need to have exactly the right composition. In doi:10.1007/978-1-4939-8745-0_12 I have published a detailed description of the protocol. In doi:10.1111/j.1749-6632.1964.tb14207.x you find the explanation. You may also read the chapter on electrophoresis in my ISBN 978-1-4419-7250-7. [Salt] in the sample should be < 50 mM.
• The material left at the top could be either very large protein, aggregated material or nucleic acids. The latter can be destroyed by passing the sample through a 27G needle a couple of times, or in a sonicating water bath. Aggregates should be spun down after heating the samples in SDS sample buffer (at 60 °C, not 95 °C). Very large proteins may be separated in an open-pore (low percentage) gel, perhaps stabilised with agarose.
• 100 V is correct during stacking, once the dye front has passed into the separating gel, you can increase the voltage. It is actually best to run these gels at constant current (10 mA per gel for stacking, 20 mA for separating), this results in low wattage (= low heating) at the beginning, when conductivity is high, but high voltage (fast separation with minimal diffusion) later.
• Make sure there are no air bubbles trapped in the system that act as insulators, and - as Adam B Shapiro pointed out- use enough buffer to ensure proper electrical contact. I rinse the wells of my gels with running buffer in a tuberculin syringe with 27G needle before addition of sample, to get rid of any air bubbles and any left over cross-linking chemistry.

Check that the side walls of your gel holder are tight and that there is no leakage. If you have liquid leakage, you will also have leakage of electricity from the side of the gel into the lower buffer reservoir.